Download the files from the links given, (obviously) and follow these instructions:

1. You unRAR (Extract) the files from the SLRR rar file you've downloaded using WinRar or WinZip or whatever program you have, and then follow the instructions to install the game (if there are any). If not, just run setup and follow instructions, shouldn't be too hard.

2. After you have installed SLRR 2.2.1, you then have to install the Miran Wichur Mod (MWM patch). In order to do that, you extract the .exe file located in the .rar file, and then run it. You'll reach a point where it asks you for the game directory. Now this, is asking you for the folder where your game installed in. After you've pressed "Browse" and found the file, click continue. The setup will install the patch.

3. When you're done with the patch, you open Davidov's/Drifer92 LE2MWM mod, and then what you do is:

i) You choose all the files from the archive.
ii)You press the "Extract" button.
iii)You find the folder where the game is installed in (just like MWM)
iv) You extract the files in the folder.
v) You have now installed the LE2MWM mod.

You have now completed the installation of SLRR with MWM patch and LE2MWM mod.

As for installing parts, it's quite simple: (im not going to explain this for those who are lazy and won't bother reading the README files inside the RARs, im explaining this for any mods that don't have README files.

1st. Make sure the mod you are downloading is for either 2.2.1 MWM or 2.3.0 LE
2nd. Download it.
3rd. Unrar the files:

@rapidkiller just don't install the Devil's v8. It doesn't make any sound anyways and if you really want it just get the MUCH BETTER rescript. And if the game now doesn't like the old engine, just edit the typeids in the system files and cars. *DONE*